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turnip: consider HW limit on number of views when apply multipos opt

Danylo Piliaiev requested to merge Danil/mesa:turnip/fix/multiview-multipos-opt-limits into master

Blob doesn't apply multipos optimization starting from 11 views even on a650, however in practice, with the limit of 16 views, tests pass on a640/a650 and fail on a630.

Fixes tests:

 dEQP-VK.multiview.draw_indexed.max_multi_view_view_count
 dEQP-VK.multiview.input_attachments.max_multi_view_view_count
 dEQP-VK.multiview.masks.max_multi_view_view_count
 dEQP-VK.multiview.multisample.max_multi_view_view_count
 dEQP-VK.multiview.queries.max_multi_view_view_count
 dEQP-VK.multiview.renderpass2.index.fragment_shader.max_multi_view_view_count
 dEQP-VK.multiview.secondary_cmd_buffer.max_multi_view_view_count

Fixes: 8d275778 ("tu: Enable multi-position output")

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